A repairable phone is the most important thing. I could buy a used flagship, but the battery will be trashed. I used to buy a phone every 2 years but now I just buy a battery every 2 years. I can use my phone knowing that if anything breaks I can have a replacement part in within a week, and I don't have to spend 100€s to ship it to some repair shop in a different part of the country.
A repairable phone is the most important thing. I could buy a used flagship, but the battery will be trashed. I used to buy a phone every 2 years but now I just buy a battery every 2 years. I can use my phone knowing that if anything breaks I can have a replacement part in within a week, and I don't have to spend 100€s to ship it to some repair shop in a different part of the country.
Fairphone 4 and 5 are also the only smartphones certified by the Swedish unions: https://tcocertified.com/product-finder/index?category=Smartphones
https://sv.wikipedia.org/wiki/TCO_Certified